My post work skills aren't too great. So, if you'd prefer, here's the main render without any postwork. The Jeep was rendered in a separate pass. The windshield dusting and rear view mirror reflection was also just post worked in.
Cheers for looking!
* Oh! Replacing the alpine fractal(like I posted in the file sharing section) with a power fractal has taken the average render time down for these scenes(in this daylight setting) from 1hr30mins, to 55 minutes, on my dual core machine. I haven't tried another twilight one yet. This one is slightly smaller in px but it's still certainly much quicker.